Ultrafast laser-driven microlens to focus and energy-select mega-electron volt protons
Ultrafast laser-driven microlens to focus and energy-select mega-electron volt protons
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DOI：
10.1126/science.1124412
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发表时间：
2006-04-21
期刊：
影响因子：
56.9
通讯作者：
Willi, O
中科院分区：
文献类型：
--
作者：
Toncian, T;Borghesi, M;Willi, O
我们提出了一种高电流、兆电子伏质子束的同时聚焦和能量选择的技术，该技术使用由强亚皮秒激光脉冲在中空微圆柱体的内壁上触发的径向瞬态电场（每米 107 至 1010 伏）。由于聚焦场的瞬态性质，所提出的方法允许从多能质子束的光谱中选择所需的范围。该技术解决了激光加速质子束当前的缺点，例如其广谱和源发散。
We present a technique for simultaneous focusing and energy selection of high-current, mega-electron volt proton beams With the use of radial, transient electric fields (107 to 1010 volts per meter) triggered on the inner walls of a hollow microcylinder by an intense subpicosecond laser pulse. Because of the transient nature of the focusing fields, the proposed method allows selection of a desired range out of the spectrum of the polyenergetic proton beam. This technique addresses current drawbacks of laser-accelerated proton beams, such as their broad spectrum and divergence at the source.